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ASAS-SN Discovery of A Probable Supernova in SDSS J153825.20+465404.1

ATel #7869; T. W.-S. Holoien, K. Z. Stanek, C. S. Kochanek, J. S. Brown, A. B. Danilet, G. Simonian, U. Basu, J. F. Beacom, T. A. Thompson (Ohio State), B. J. Shappee (Hubble Fellow, Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), D. Bersier (LJMU), Subo Dong (KIAA-PKU), J. Brimacombe (Coral Towers Observatory), E. Falco (CfA), P. R. Wozniak (LANL), D. Szczygiel, G. Pojmanski (Warsaw University Observatory)
on 3 Aug 2015; 17:49 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Thomas Holoien (tholoien@astronomy.ohio-state.edu)

Subjects: Optical, Supernovae, Transient

Referred to by ATel #: 7931

During the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN or "Assassin"), using data from the quadruple 14-cm "Brutus" telescope in Haleakala, Hawaii, we discovered a new transient source, most likely a supernova, in the galaxy SDSS J153825.20+465404.1.

ASASSN-15no was discovered in images obtained on UT 2015-08-03.26 at V~16.4 mag. We do not detect (V>16.9) the object in images taken on UT 2015-07-30.31 and before. This figure shows the ASAS-SN V-band reference image (left), the ASAS-SN V-band discovery image (center), and the archival DSS image of the host (right). The red circle has a radius of 5" and is centered on the position of the transient in the ASAS-SN image.

The position of ASASSN-15no is approximately 2.4" North and 0.9" East from the center of the galaxy SDSS J153825.20+465404.1, which has no redshift available in NED. Properties of the new source and photometry are summarized in the tables below:

 
Object       RA (J2000)     DEC (J2000)      Disc. UT Date   Disc. V mag  Approx. Abs. Mag   Offset from Host (") 
ASASSN-15no  15:38:25.30    +46:54:06.6      2015-08-03.26      16.4             N/A                2.56 
 
Obs. UT Date         V mag 
2015-07-30.31        >16.9 
2015-08-03.26         16.4 

Follow-up observations are encouraged.

We thank LCOGT and its staff for their continued support of ASAS-SN. ASAS-SN is supported in part by Mt. Cuba Astronomical Foundation. For more information about the ASAS-SN project, see the ASAS-SN Homepage and the list of all ASAS-SN transients.